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SOHC.co.uk Forums => CB500/550 => Topic started by: Mike_Berkshire on February 09, 2025, 02:58:26 PM

Title: Sprocket nuts seized
Post by: Mike_Berkshire on February 09, 2025, 02:58:26 PM
Hi all. Front hub polished and now on to rear hub. I need to replace the worn rear sprocket so thought I would remove the old one before I start polishing. I have flattened the tab washers, given the studs/nuts a good squirt of penetrating oil and left them to soak. However all 4 nuts seem seized solid. Before I resort to more destructive methods of removing the nuts are there any tricks/techniques to try? ‘76 550 K2
Title: Re: Sprocket nuts seized
Post by: Johnwebley on February 09, 2025, 03:01:28 PM
Heat

Rattle gun

More penetrating oil,diesel is very good

Apply all over the next week

Unless your in a rush

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Title: Re: Sprocket nuts seized
Post by: Johnny4428 on February 09, 2025, 03:47:06 PM
Bit of heat in case somebody’s been in there with thread lock?
Title: Re: Sprocket nuts seized
Post by: Honda enthusiast on February 09, 2025, 04:25:26 PM
loctite freeze and release is worth a try, Mike..not cheap at £20 a can but it freed my wheel nuts on a 1972 Massey 165
Title: Re: Sprocket nuts seized
Post by: McCabe-Thiele (Ted) on February 09, 2025, 07:16:19 PM
I used a cordless Impact Driver as I'm old (77 soon) & weak, one of my better buys a few years ago that I bought to undo car wheel bolts.
Title: Re: Sprocket nuts seized
Post by: Johnwebley on February 09, 2025, 07:21:25 PM
I used a cordless Impact Driver as I'm old (77 soon) & weak, one of my better buys a few years ago that I bought to undo car wheel bolts.
I have done the same

It's a Chinese Makita copy,

About £25

Plus the same for a battery and charger

I find it OK for hobby use,

Aliexpress, lots of fun toys you never realised you wanted!!!



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Title: Re: Sprocket nuts seized
Post by: K2-K6 on February 09, 2025, 08:28:23 PM
Is it just the hub assembly and minus the spokes rim etc ?

If so, you'll probably need to anchor it with a chain to get adequate leverage on them. 

As above though, a rattle gun can help you. I bought a makita 1/2 drive one that's beennreslly useful, along with common batteries we've got with other tools.

Title: Re: Sprocket nuts seized
Post by: Mike_Berkshire on February 09, 2025, 08:41:56 PM
A good heating with a gas torch and a bash with the trusty impact driver and the job is done.

The nuts are a bit chewed up; do I need special nuts as replacements or are any nuts ok? The ones I have seen online all seem to be flanged and some are nyloc.
Title: Re: Sprocket nuts seized
Post by: Bryanj on February 09, 2025, 09:18:28 PM
They are thinner than normal
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